Error : This event loop is already running

I run rasa shell and I get the output below. I can type stuff in but when I press return the command line freezes.

I have installed rasa as per the page Installation. I am using Python 3.7 (after spending a lot of time trying to get it working with Python)

PS C:\Program Files\rasa> rasa shell --debug 2020-01-27 11:46:10 DEBUG rasa.model - Extracted model to ‘C:\Users*\AppData\Local\Temp\tmp24afqksa’. 2020-01-27 11:46:10 DEBUG rasa.cli.utils - Parameter ‘endpoints’ not set. Using default location ‘endpoints.yml’ instead. 2020-01-27 11:46:10 DEBUG rasa.cli.utils - Parameter ‘credentials’ not set. Using default location ‘credentials.yml’ instead. 2020-01-27 11:46:10 DEBUG rasa.model - Extracted model to 'C:\Users*\AppData\Local\Temp\tmpucaow731’. 2020-01-27 11:46:12 INFO root - Connecting to channel ‘cmdline’ which was specified by the ‘–connector’ argument. Any other channels will be ignored. To connect to all given channels, omit the ‘–connector’ argument. 2020-01-27 11:46:12 DEBUG sanic.root - CORS: Configuring CORS with resources: {’/’: {‘origins’: [’’], ‘methods’: ‘DELETE, GET, HEAD, OPTIONS, PATCH, POST, PUT’, ‘allow_headers’: [’.’], ‘expose_headers’: None, ‘supports_credentials’: True, ‘max_age’: None, ‘send_wildcard’: False, ‘automatic_options’: True, ‘vary_header’: True, ‘resources’: {’/’: {‘origins’: ‘’}}, ‘intercept_exceptions’: True, ‘always_send’: True}} 2020-01-27 11:46:12 DEBUG rasa.core.utils - Available web server routes: /webhooks/rest GET /webhooks/rest/webhook POST custom_webhook_CmdlineInput.receive / GET hello 2020-01-27 11:46:12 INFO root - Starting Rasa server on http://localhost:5005 2020-01-27 11:46:12 DEBUG rasa.core.utils - Using the default number of Sanic workers (1). 2020-01-27 11:46:12 INFO root - Enabling coroutine debugging. Loop id 1904835644936. 2020-01-27 11:46:12 DEBUG rasa.model - Extracted model to ‘C:\Users*\AppData\Local\Temp\tmpwt9rwrqm’. 2020-01-27 11:46:20 INFO absl - Entry Point [tensor2tensor.envs.tic_tac_toe_env:TicTacToeEnv] registered with id [T2TEnv-TicTacToeEnv-v0] 2020-01-27 11:46:22 DEBUG rasa.core.tracker_store - Connected to InMemoryTrackerStore. 2020-01-27 11:46:22 DEBUG rasa.core.lock_store - Connected to lock store ‘InMemoryLockStore’. 2020-01-27 11:46:22 DEBUG rasa.model - Extracted model to 'C:\Users*\AppData\Local\Temp\tmpcttohyl3’. 2020-01-27 11:46:22 DEBUG pykwalify.compat - Using yaml library: c:\users*****\appdata\local\programs\python\python37\lib\site-packages\ruamel\ 2020-01-27 11:46:24 DEBUG rasa.core.nlg.generator - Instantiated NLG to ‘TemplatedNaturalLanguageGenerator’. Bot loaded. Type a message and press enter (use ‘/stop’ to exit): 2020-01-27 11:46:24 ERROR asyncio - Task exception was never retrieved future: <Task finished coro=<configure_app..run_cmdline_io() done, defined at c:\users******\appdata\local\programs\python\python37\lib\site-packages\rasa\core\> exception=RuntimeError(‘This event loop is already running’)> Traceback (most recent call last): File “c:\users*\appdata\local\programs\python\python37\lib\site-packages\rasa\core\", line 128, in run_cmdline_io server_url=constants.DEFAULT_SERVER_FORMAT.format(“http”, port) File "c:\users*\appdata\local\programs\python\python37\lib\site-packages\rasa\core\channels\”, line 131, in record_messages text = get_user_input(button_question) File “c:\users*\appdata\local\programs\python\python37\lib\site-packages\rasa\core\channels\", line 77, in get_user_input style=Style([(“qmark”, “#b373d6”), ("", “#b373d6”)]), File "c:\users*\appdata\local\programs\python\python37\lib\site-packages\questionary\”, line 45, in ask return self.unsafe_ask(patch_stdout) File “c:\users*\appdata\local\programs\python\python37\lib\site-packages\questionary\", line 59, in unsafe_ask return File "c:\users*\appdata\local\programs\python\python37\lib\site-packages\prompt_toolkit\application\”, line 810, in run return loop.run_until_complete(self.run_async(pre_run=pre_run)) File “c:\users*\appdata\local\programs\python\python37\lib\asyncio\", line 570, in run_until_complete self.run_forever() File "c:\users*\appdata\local\programs\python\python37\lib\asyncio\”, line 525, in run_forever raise RuntimeError(‘This event loop is already running’) RuntimeError: This event loop is already running Your input ->


I had “loop” issue when I run shell. I solved it by installing of next packages:

pip install google-auth==1.10.1 prompt-toolkit==2.0.10 questionary==1.4.0 SQLAlchemy==1.3.12 urllib3==1.25.7

Could you check it too?


Great. This was solved my issue and able to run rasa shell, Thanks.

1 Like

Thank you, this worked also for me on Windows 10 with python 3.7.6. Now I can run rasa shell.

Update: it was enough downgrading only questionary to ==1.4.0


This solved my issue.

Not sure why higher version of those libs are not supported when it gets installed through dependencies.

Downgrading it fixed the issue.

1 Like


厉害 谢谢你

thanks man. This worked for me.

Try to upgrade to rasa 2.7

running rasa 2.7.1 on ubuntu 20.04. Same error with rasa shell. Downgrading questionary to 1.4.0 solved problem.